An old address may have a new owner

Answer An old address may have a new owner. RFC 7293 defines Require-Recipient-Valid-Since so a sender can say the mailbox should have been valid continuously since a date the sender still trusts. If the receiving system knows the mailbox was created later, it can refuse the message. That refusal is about ownership. It is not a score for the whole file, and it is not a promise that every old address is still the same person.

The note that started this: RFC 7293, Require-Recipient-Valid-Since Header Field, RFC 7293.

Solo ad files age in a drawer. People abandon mailboxes. Providers, sooner or later, give some of those mailboxes to someone else. The new person did not opt in to the offer. The new person also did not ask to be counted as your click. If you are comparing best solo ad vendors, ask how old the addresses are before you ask how cheap they are.

The document is a header and a matching SMTP option. The sender states a moment in time. The receiver, if it keeps a record of when the mailbox came into its current ownership, compares that record with the moment. A match can let the message through. A newer mailbox can stop it. A receiver that does not keep the record can accept the message anyway. Acceptance in that last case means the receiver did not know. It does not mean the owner is the same human who joined a list in another year.

What does Require-Recipient-Valid-Since mean?

RFC 7293 lets a sender say the recipient mailbox should have been valid continuously since a given date. The point is to catch an address that was recycled to a new owner. It is not a census of list quality.

Read the name as a sentence. Require the recipient to have been valid since this date. Valid, in this document, is about the mailbox's continuous ownership, not about whether the person likes your offer. A seller who translates the header into a phrase like verified leads has changed the subject. The header does not interview the person. It asks a system that might know the mailbox history to check a date.

You will not see this header on most solo ads you buy this month. Adoption is not a number this note will invent. The useful fact is the problem the header was written to name. Recycled mailboxes are real. A file sold as evergreen can contain addresses whose current owners never met the seller.

• The quote names the age of the file in a unit you can check.
• A refusal about mailbox ownership is not called a bad creative.
• A silent accept is not called proof the owner is unchanged.
• The seller can say what they do when an address comes back as recycled.

Does an old solo ad address still belong to the person who opted in?

Not always. Mailbox providers reuse addresses. An address that opted in years ago may now belong to someone else. Ask the seller how old the file is and what they do when a mailbox has a new owner.

Age is a fact about the row, not a vibe about the niche. A list built last week and a list carried since a different decade can wear the same description on a sales page. The page says buyers, or homeowners, or people who click. The row says an address. Between the page and the row sits time. Time is when the owner can change without the row changing.

When you buy solo ads, put the question in the order notes. How did these addresses join, and in what year? What happens to a bounce that says the mailbox is new? A seller who has an answer is further along than a seller who has a slogan. You are still buying one send. You are entitled to know whether the humans on the other end had a chance to be the humans in the story.

Should a buyer treat this check as proof the list is clean?

No. The mechanism is a request a receiving system may honor if it knows the mailbox history. Many systems will not. A missing rejection is not a clean file.

A clean file is a file whose current owners asked for this kind of mail, recently enough that the request still means something, with dead addresses removed. Require-Recipient-Valid-Since touches one slice of that work, and only when the other side cooperates. Paying extra because a seller mentions the header is paying for a tool they may not even turn on. Ask them to show a message where the field was set, and a log where a recycled mailbox was refused. If they cannot, they are describing a document, not their process.

RFC 7293 is a way to say the date out loud. Say the date out loud on the order. An address without a date is a stranger who might be two strangers in a row.